Medicine Chapter 5 Homework This Type Engine Called Hybrid Rocket Engine

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Chapter 5

5.1 What is an igniter?

5.2 What is the propellant in a solid motor called?

5.3 Define burning surface.

5.4 What is the purpose of the thermal insulation barrier on a solid rocket motor?

5.5 Define HTPB.

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5.6 Define PBAN.

5.7 What is APCP?

5.8 Describe the mix of the Space Shuttle SRB grain.

5.9 What is the perforation?

5.10 Describe several types of perforations and explain the type of thrust profile they

produce.

5.11 Define the three solid motor modes of burn and sketch their thrust profiles as a

function of time.

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And see Figures 5.6 and 5.7 in the text.

5.12 Using the data given in Example 5.1 model the burn rate of the SRBs and develop

a sketch of the burn rate versus the burn rate coefficient and of the pressure

exponent.

5.13 Use Equation 5.3 to show that the m-dot of a model rocket engine with no

perforation is a function of the radius of the engine. What would the thrust profile

of this engine look like?

5.14 What are injectors?

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5.15 How are injectors and stoichiometric ratio of fuel and propellant related?

5.16 What is cavitation?

5.17 What is pogo?

5.18 How is pogo controlled?

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5.19 Discuss two types of liquid rocket engine cooling?

5.20 Describe a hybrid rocket engine.

5.21 Describe a reverse hybrid rocket engine.

5.22 Define the Coulomb force.

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5.23 What is the Lorentz force?

5.24 An ion thruster has a grid voltage of 4000 V and uses Xenon for propellant. What

is the exit velocity of the engine.

5.25 If the engine in Exercise 5.24 fires for 10 days continuous what is the Isp of the

engine?

5.26 In Exercises 5.24 and 5.25 determine the thrust of the ion engine. Assume a total

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5.27 In a Hall thruster describe the purpose of the swirling electron field.

5.28 What is FEEP?

5.29 A PPT has an exit velocity of 14,000 m/s, produces 1 mN of thrust, has an m-dot

of 9×10-8 kg/s, has an Isp of 1,200 s. If the engine has a 10,000 V charge on a 10

PF capacitor what values of discharging and charging resistors are required?

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5.30 What is NEP?

5.31 What is SEP?

5.32 Define luminosity.

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5.33 How are brightness and irradiance different?

5.34 What is NTR?

5.35 What is STR?

5.36 Discuss how a solar sail is analogous to a rocket engine and why it is called a

photon based engine.